Clock



FIG. 1 is a front perspective view of a clock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view of FIG. 2, the right side being amirror image thereof; and

FIG. 5 is a top plan view of FIG. 2.

The ornamental design for a clock, as shown.